To get uncut diamonds you can get them as a monster drop, from one of the gem stores, buy from other players, or purchase through the grand exchange.
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Prices are changing alot for diamonds, but right now an uncut diamond's price is 10,600 gp.
Uncut Dragonstone + 3 Runite Bars
You take or buy a chisel and have to have a high crafting level and then just cut it.
You can get an Uncut emerald from drops or the Grand Exchange, or coming across them while mining, some monsters that drop Uncut Emeralds are a Combat Level 63 Ork Statue or Combat Level 75 Ogre Statue.
a sapphire from an uncut sapphire by using a chisle on it, and smelt a gold bar into a sapphire necklace.